Steam dome for locomotives



Feb. TU: 1925. 1525:8311

H. w. SNYDER STEAM DOME FORLOGOMOTIVES lFFUP Q 1922 WITNESS INENTR z MHZ/ 7 BY I 7 W ATTORNEYS Patented Feb. 10, 1925.

HERBERT w. sNYnna, or LIMA, 01110.

STEAM DOME FOB. LOCOMOTIVES.

Application filed June 1, 1922. Serial No. 565,163.

To all whom it may concern:

Be it known that I, HERBERT W. SNYDER, a citizen of the United States, residing at Lima, in the county of Allen and State of Ohio, United States of America, have invented certain new and useful Improvements in Steam Domes for Locomotives, of which the following is a specification. V

This invention relates to steam domes for locomotives and particularly toa novel and improved arrangement of dome having a valve casing for a throttle, shut-01f or other form of valve, so arranged that the interior of the dome is practically unobstructed to permit of the placing of other apparatus therein, such for example, as a steam separator or the like.

Another object is to provide an improved dome provided with an external valve chamber arranged so as to permit of constructing the dome proper of the largest size possible within clearance limits.

My invention also contemplates a construction of dome having a large internal cavity, readily accessible to.

The improvement is especially useful in connection with an arrangement in which the steam or dry pipe of the locomotive is arranged exteriorly of the boiler, as it eliminates very cumbersome and expensive construction which would otherwise be necessary.

The foregoing, together with such other objects as may hereinafter appear, or are incident to my invention, I obtain by means of a construction which I have illustrated in preferred form in the accompanying drawings, wherein:

Fig. 1 is a fragmentary and diagrammatic side elevation of a locomotive boiler, equipped with my improvements; Fig. 2 is an enlarged section taken on the line 2-2 of Fig. 1; and Fig. 3 is an enlarged section taken on the line 33 of Fig. 1.

Referring now to Fig. 1, the reference numeral 7 designates the boiler of the locomotive, and the reference numeral 8 designates the steam or dry pipe, which in this instance, is located exteriorly of the boiler. The main cylinders and valve chests and the intermediate connections and parts between the dry pipe proper and the valve chest are not shown, such parts and their arrangements being well known in this art.

The improved dome is indicated as a whole by the reference letter A, and it preferably consists of a steel casting comprising the dome proper 9 having a flange 10 for attachment to the boiler shell, and a valve chamber 13 communicating with the interior of the dome 9. This valve chamber, it will be seen, is arranged exteriorly of the dome, and preferably opens laterally therefrom, so as to make a neat, compact arrangement providing the necessary clearances.

The casing 13 has a flange" 14 for attachment to the flange 15' ofthe stufling box 16 which receives one end of the dry pipe 8. At this end the casing is open, the member 17 being a spider supporting one free end of the valve stem 18. In the interior the casing is provided with a valve seat 19 on which the throttle, shut-off, or other form of valve 20 is adapted to seat.

At the other end, the valve casing 13 has an opening 21 of suflicient size to permit of the insertion and removal of the valve 20. The hand wheel end of the valve stem 18 extends through a head or end plate or cap 22 which is bolted or otherwise secured to the flange 23 of the valve casing, closing the open end 21 thereof. The valve stem 18 is threaded in the cap 22 and the latter is provided} with a suitable stufling box 24 to prevent leakage. The top of the dome is closed by the cover plate 25.

It will be noted that the dome 9 is roughly cylindrical in shape, i. e., the vertical wall is substantially straight, thereby affording an internal cavity of maximum size with minimum overall height, which is of importance in connection with clearance limitations. The dome also has its flange 9 for attaching the plate 25 projecting laterally outward, an arrangement which does not encroach on the space within the dome and ensures full exposure on removal of the cover plate.

It will be seen from the forgoing that the arrangement is such as to combine simplicity and strength with a maximum internal cavity, practically wholly unobstructed for the reception of additional mechanism of the character herein-before noted. At the same time access is had to the interior of the dome very readily by simply removing the cap 25, in which connection it is also to be observed that access is had to the interior of the dome without necessitating disturbing the valve which is a feature of advantage, particularly in case the valve should Wear unevenly, in which event, if

it were necessary to disturb the valve in order to get access to the interior, it might be difiicult to prevent leakage withoutre' I; grinding the valve and its seat.

The valve 20, in the emhodimentshown,

is a shut-otf or emergency valve, enabling the shutting off of the steam supply in case of a throttle failure, or it is desired to make throttle or other repairs of a'charaeter such as topermit of their being made with steamon the locomotive.

The opening-Wis provided for inspection It is therefore on for" a steam connection. normally closed.

I claim 1. Ina locomotive having an outside dry,

pipe, a cast metal steam dome having a shutofi' valve casingopemng laterally therefrom, saidcasing: COIIiHlilIllCatl-Hg, at one end communicating therewith.

3. In a locomotive a steam dome, a discharge pipe therefrom exterior of the boiler, and shut ofi- 'mea-ns between the pipe and the dome, andmeans affording access to the shut off means without disturbing the pipe.

4; In a locomotive, the combination of a steam dome and avalve casingopening laterallyjfrom the dome and approximately coextensive with the dome in height.

In-testimony whereof, I have hereunto signed my name.

HERBERTW. SNYDER; 

